I'm getting back into my foxbody again and thinking about adding a turbo to my 331, possibly the on 3 kit. Currently I have the pms4 however I have always had idling issues with warm up and rpms that would go up and down and either smooth out or stall. I'm not that great using the inputs and would require someone else to tune for me should I go turbo route. I saw youtube video of a guy donny b with the on3 and microsquirt and it seemed he did pretty well self tuning with the aid of wide band a/f. Is it really that easy? Is this a fairly new software or is this being being replaced by megasquirt? I really liked the harness he used similar to my pms. I would like to keep the a/c, are the other programs that much better then the pms. I'm not so certain there will be another version for the pms to upgrade and that has me thinking to make the switch as well as I don't see much now with the pms.

The MegaSquirt family is a set of standalone ECUs that completely replace the stock ECUs. MicroSquirt is currently a relatively entry level item in the MS lineup. The autotune feature is something that's built into the tuning software and can adjust fuel and warmup tables, but there's no corresponding feature for the spark table.

Anderson PMS is a piggyback system used in combination with the stock ECU.

To the OP: Megasquirt and Microsquirt are the hardware components that you'd actually install in the car, typically to replace the stock ecu entirely. Tunerstudio is the software used to program the Mega/Micro components (tune the car).

If you install a wideband gauge/controller/sensor, you can use a tunerstudio feature called VE Analyze Live (the auto-tune ppl speak of) which uses wideband data to adjust the fuel table based on AFR Targets that you set in a different table. This will not tune your Spark table so people typically set up a safe table, get the fuel table shaped up, then adjust ignition table for best torque. It works pretty well but the whole tuning process in general can be very daunting to beginners, though it becomes second language after some time.

Some people (like Blown88GT) up there utilize the MAF which can make fuel tuning a lot simpler/easier. Most delete the MAF sensor and tune a different way (Speed Density). I've done the speed density thing a few times and will soon be trying MAF to see how different it is.

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